Centering for fireproof floor constructions.



PATEKTED MAR. 31, @908 V G.'B.WAITE. GBNTBRING FOR FIREPROOF'FLOORCONSTB'UGTIONS.

APPLIQATION EILEDAPR, 16. 1906.

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CENTERING FOR FIREPROOF FLOOR CONSTRUGTIONS.

Specification of Letters Patent.

Patented March 31; 1908.

- Application filed April 16, 1906. Serial No. 311,986.

- Tooll whom it may concern:

Be it known that l, GUY B. Warm, a citizen of the 'United States,residingin the city, county, and State of New York, have inventedcertain new and useful improvements in Centering for Fireproof FloorConstructions, of which the following is a specification. y

This invention pertains tocentering or su pporting dey ices for concreteand similar 'lloor constructions; and has for its object to provide asimple and inexpensive structure capable of being assembled in a rapidand convenient manner. One feature of the invention resides in a novelextensible and contractible moldor centering member proper molds withoutleaving objectionable gaps in the concrete when the centering has beenremoved. I i

Other minor features will appear in. the following description of thedrawings, representing preferred forms of the-invention, in which--Figure 1 is a cross-sectional view of a floor structure employing myimproved centering, the section eing parallel with the floorbeams andtransverse to the molds or centers;

I Fig. 2 is a section at right-angles to the section of Fig. -1 Fig. 3is a top plan view of the floor-beams and centering, the concrete beingomitted; Figs. 4, 5, 6 and 7 are detail side elevational views ofvarious forms o'f iny im-' proved hanger Fig. 8 is a detailcrosssectional view through the adjacent sides of two molds and theintermediate supporting-bar;

Fig. 9 is a perspective view of an end. portion of the intermediatemember of the. mold or center; Fig. 10 is a perspective view of an endmember ofthe mold or center closed at the end by a wooden or otherclosure; Fig. 1 1 is a longitudinal section throu h an end memliber'having an integral end closure;-Fig. 12

shows a form of hanger at present inuse, on which my present hanger isan improvement; Flg. 18 1s a comparative view, similar to Fig.

. 8, illustrating a defect of the style of hanger shown in Fig. 12;Figs. 14 and 15 are views similar to Figs. 2 and 1, respectively,showingmy improvements as applr to the construction of a llat arch Fig.1.6 is a perspective view showing thew'lorm and telescopic relation ofthe molds or centers used in the flat. arch construction shown in Figs.14 and 15; Figs. 17 and 18 are pers )ective and crosssectional views,respectively,- of a modified form of slmet-nietal centers, wherein oneedge of each center issupported on the edge of the nextadjacent center:and figs 19 and 20 are sectional views illustrating forms of combinationwood and metal centers.

Referring to the -lrawings, A designates the usual floor beams of I-heamform, and B designates a series oi relatively light bars, herein shownas channels, extending between adjacent lloor-beams and stepped at theirends on the lowerflan-ges thereof. On the bars B are suspended near thepoints of support of said bars on the i'loornbeams, hangers which formthe direct supports of. the molds or centers.

Figs. 4, '5, 6 and 7 show a variety of forms of Y hanger all of whichare within the scope and purview of my invention. In Fig. 4. thehangerconsists simply of ametalrod C having its end portions 0 bent up andterminating in hooks 0, both of which. turn in the same direction.

In Fig. 5 the hanger oi F ig'. 4 is stiffened. or

reinforced by a stiffening-piece D secured thereto at its ends. In Fig.6 the stiffeningpiece D alone forms the intermediate portion of thehanger, the inwardly bent shanks of the hooks 0 being secured thereto asshown. Fig. 12 illustrates an old form of hanger E 01 this class inwhich the hooks e at the ends are turned in opposite directions. Fig. 13shows how, when the molds or centers are supported by hangers of thisold form hung iron] the bars B, a gap in the concrete tillingnecessarilyoccurs beneath the bars B; and Fig. 8 shows how my improved hangerobviates this by allowing the edges of adjacent molds'or centers tosubstantially meet beneath the bars. Fig. 7 shows another form of hangercapable of effecting the purpose of my invention in this respect, thesame consisting of a rod F the end portion f of which at-one end isturned upwardly and bent to form a hookf; while at its opposite end asmall hook f is formed ada ted to overlie and rest upon the adjacentrangers just behind the upwardly turned end portion f thereof.

The moldsor centers, whichforni the direct supports or carrying membersof the concretefilling mater al and give it the de sired arch formationon its under side, are of a general inverted U-shape or arch form incross-section, each consisting, in the principal form shown in Figs. 1to 3 and 9 to II, of an intermediate member G, and telescoping endsections H, whereby the mold is made lon' itudinally extensible andcontractibie to fit fifierent len ths of span. These members areconveniently and preferably made of sheet metal pressed to the desiredform, and have along their horizontal margins laterally pro jectingflanges g and h, respectively. The outer ends of the end sections may beclosed as by an inserted wooden or other closure I (Figs. 2 and 10), orthe end closure may consist of an integral end wall I (Fig. 11). Qrtheend closures I and I may be omitted and the end section H carried upagainst the web of beam A, bein notched or cut away to override the baseange of the beam.

Fi s. 14, 15 and 16 show the invention as a plled to the construction ofa flat arch w erein the concrete filling extends to or below the loweredge of the floor-beams. In

- this construction the molds or centers K and K lying betweenadjacentfloor-beams may each consist-0f a single shallow channelsection, the sections K and K, which are longitudinall alined,telescoping each other beneath t e floor-beams, as lainly shown in Figs.14 and 16. The low side walls'of these sections may be stiflened byinwardly turned flanges k, if desired.

It will be observed that in all cases the light bars B are embedded inthe concrete and become permanent reinforcements of the tension regionof the concrete ribs or beams formed between the sides of .the molds(Fig. 1) or above the latter (Fig. 14) The molds or centers may beremoved and used over again by clipping off the-hooks of the hangers, orthey ma remain as a permanent'centering where g and 72. help to stiffenthe upright part of the centers G and H as well as to complete thecentering.

. So far as the novel form and structure of the molds or centers isconcerned it is evident .be omitted.

that othersupports than the bars and hangers might be employed; and,conversely, the latter can advantageously be used with other formsof'molds or centers than those shown and described. For instance, whentempora wooden or other supports are used on whichthe sheet iron centersrest, the flanges g and h are not necessary; and the centermg can beraised or lowered to suit the height of the arch by raising or loweringsuch temporary su ports. Such temporary supports would a vantageously beused where the concrete was. strong enough not to require thetension-bars B. 1n whic case the latter would ut the combination of thefeatures herein shown provides a. simple, light, strong and readilyadjustable centering esired. The flanges I claim construction welladapted to the erection of fconcretefloors of the ty e shown and de- Incases where t e supporting bars scribed. B are used not only as areinforcement to the concrete but to support the molds or centers, as.shown, it is an advantage to make the m'oldor center cover the centralportion of the span between the floor-beams and serve as a. carryin beamto uphold the concrete and carry c loads thereof, through the hangers,to points on the barsclose to the supports of the latter on thefloor-beams, since relatively light-bars, well. adapted to serve astensile, concrete reinforcements, can

thus be used.

Figs. 17 and 18 show a formof sheet-iron molds or centers L, having aside wall 1 on on] one side (except. at the end of the series), ,t eopposite edge of the center overlapping and resting on the next adjacentcenter, an having notches m to accommodate the vertical portions of thehangers.

Said edges may also lie beneath guiding and 1 locking teeth n unched upfrom the flat be a wooden beam or plank, the connecting member N being ahollow metal piece. Fig. 20 shows the converseof this arrangement,wherein the'lon sup orting members M are of .hollow meta te escoping attheir ends over a short wooden connecting iece N. This form of centeringis especial y adaptable to fiat arches.

1. In a centerin construction, the combination with a mo d or centerconsisting of a plurality of telescoping sections of archshape incross-section, each provided with integral laterally projectin marginalfla es adapted to'support the ling material tween laterally adjacentmolds, of hangers each extending between and beneath said flanges andsup orting said mold sections, substantially as described.

2. In a centering construction, the combination with a series of barsextending between and supported at their ends on adjacent fioor-beams,of a series of arch-shaped molds lying between and parallel with saidbars and having marginal flanges extending laterally beneath the latter,and hangers supporting said molds from said bars and permitting thelatter to be embedded on all sides in the filling material,substantially as described 3. In acentering construction, the com- 4. Ina'centering constructlon, the com- 1 bination with a series of barsextending between and supported at their ends on adjacent floor beams,of hangers having'hooks turned in the same direction hung frornandacross said bars, and molds or centers supported on said hangersandprovided with 'tially as described.

lateral flan es that extend beneath said bars, substantia y asdescribed.

5. In a centering construction, a' multipart extensible andcont-ractible mold or center consisting of a main intermediate sectionof agene'ral arch-form in cross-section and end sections of the sameform telescoping therewith, said and sections being closed at theirouter ends to support and give form to the filling material ly ngthereagain st, substan- GUY BQ'WAITE. r

Witnesses:

JEss'E GRANT ROE, LnoNARD 0. Ron.

